The city of Transdanubia would manage flash floods by rebuilding reservoirs and stream beds

The assessment of grant applications will determine whether work can begin along the Nagypáli stream on behalf of the Zalaegerszeg Local Government. As part of the project, the stream would be regulated between sections 4+630 km and 6+450 km, and flood peak reduction reservoirs would be built at sections 4+735 km and 5+920 km. According to the notice published in the EU public procurement notice, the contract was awarded to INTER-TEFU Kft..

Barrages and reservoirs may be built

According to the project description, in addition to the river bed realignment on the two sections, two valley closure dams would be built, together with the connecting structures. One of the valley closure dams would have the following dimensions:

• length: 85 metres
• maximum height: 7 metres
• crown width: 4 metres.
• The estimated volume of the dam is 5640 cubic metres.
• Total reservoir volume at flood level: 165 000 cubic metres.

A waterproof layer would be placed on the earth dams

The length of the other dam is 143 metres, with an estimated volume of 5100 cubic metres. While the reservoir has a volume of 84 thousand cubic metres. The total material requirement of the two dams is 17,744 cubic metres. Both would be earth dams with a clay impermeable layer.
The project includes the completion of the embankment and embankment protection works at the end of the automotive test track outlets. At the designated points, concrete bank
connections would be constructed with termite stone, which would also be
connected to the constructed ford as one of the contractor's tasks. The tender also provides for the construction of some 1 500 m of temporary material transport routes.

Widening of the Ságodi stream bed

Another announcement has also been published in the public procurement notice, in which the Municipality of Zalaegerszeg is looking for a contractor to carry out the riverbed regulation on the section of the Ságodi stream above Tó Street.

The aim of the project is to ensure that rainwater is diverted from the affected area in a controlled and non-damaging way. The plans for the embankment works were drawn up by Forsz Mérnöki Iroda in 2022.
According to this plan, the bed of the Ságodi stream, which feeds the Gébárti lake, a popular hiking
place in the city, would be rebuilt over a length of 900 metres, with a 1-3 metre bottom width and a maintenance
lane. The planned cross-section would be constructed by dredging and in places by filling. In order to prevent erosion, the bed will also be grassed by the contractor.
The deadline for tenders is 21 November.